Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508ea9b84c44695850cbbdabe2e7ecc71ea2be20fd0ab2c2df81b993bc642e00' 
  AND token = 'Buc7yLZPckpRUkmVJ9KvVQlSgEULCu2L1uZ8ySCGmxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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