Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1017c07bcbf25c9be8c6fab8e5478d3bbbc0445adaa0cf5ae766bcb2717b2f2' 
  AND token = 'r/jdj7LUuAmjVK7mpfckBxDPaa7h447EX3LBTzQqo/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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