Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6179e614ef5ed89dce73b9cf44d64da1eef7f5d8af33cf7ad8b0a07b23b3f20f' 
  AND token = 'uG4e+pbBkWliS4Ut7ZfC5m0BoRf/y1UlZ5hwzQPg1TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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