Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d9e55e20b5ad889640477ca910e187e791f66dc808d2e3bf02c7339e384df2' 
  AND token = '9CrikpxrTYY63gR8bVK5vhppB40YDUhlqzRaxdbiwb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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