Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c651145cc2788a1f56b363947d86f8405fa7901254a14af53341a8fb1b8ac037' 
  AND token = 'FQQPjxrL9zmtMTgPXpuAT0zcbxWKNJEDVkra27cWpRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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