Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5248964f8cfd32ffac7174b6e4acf5ee327acdd9fc587f88f3bc94e6d00b1e41' 
  AND token = 'iu4fuKTo4xVOr48Rn777uvqaKuu6Ysj9y1ZRyOMZhZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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