Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7255a2dc61a392a7284ca48f4b48f9cf8cedabd2db6df5fbda358d761f12fba' 
  AND token = 'MaDWlaU76m5aMeuUgcjBNX7WOMkEZ2kI1CWFPqqnjvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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