Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298da38b26103dafeb997e5e0b030535efbd51810ddbcd5d7e1eaa97d8d41228' 
  AND token = '/pNbyBkz2fzRcdfL1S6FFcjYgKf5Q6ADMP1E4Vv7z74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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