Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fcebd7cff40e81f3ae4c7d770d0fe1e69899f00ca65ebf1cc5f3feabe4c860' 
  AND token = '9WbfHI7oeqHBMBFlJLQCxBHKHarOuvZbNc37qLAEneE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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