Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2df2228c0664479f4c1bbe8fa1817cb2a043bf578e2af6723c4841d1317a08' 
  AND token = 'JCIKgQ8Nsxia4PRoigUmH4cJVvADEjCPRNaZ7nzEXrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}