Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12640272968a67860ea2e56c80eae490c2e55e8f0c3bb9784b755de3d2547c78' 
  AND token = 'B6MVcRvETqQcEngaFOPHrZ23B00anVrdJMwpkMJMHuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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