Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3742feea1fc2a6ed96b1e783b96c9273dec32c740614e113cd0e4b5b8a728a4' 
  AND token = '0qbcIOlFlHqXj/Qv9o1W+FHBJN6ZQBnlnky/5ISEJ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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