Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b1a899df8e91ba4930be6665bb841e72a4d9fe8b63b72c6ee752602dcbf7f5' 
  AND token = 'b9n1EaYP7jqQ8bU4M2C4U1k3anIfc1co4DjlOGROR3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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