Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1416ab85edf9ce8c582eaa209f3bdce43085a86a9db309700eef33cea9ad6f78' 
  AND token = 'jezQwJVwx4CJk1c+Hj1OYKLgddbo8Qaue4cprj5V/3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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