Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9cc77558b85915cf5be0cad9e2fc96f0b8f4de7f7842b1b15c354635f48409' 
  AND token = 'NcdfBcECDGfa8ssounx3sxjTNEHXv/keso4sGbRqjO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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