Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260523fb75fe443f6f998cdfdc3e6799518116083db1ec52553115ca952adf27' 
  AND token = 'wwgzrqfrPPhERgzmxrRQwnaI89fsMwoSPdjSt+qD5ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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