Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b5e2f580e2769b0c3b05a645fad87f39f98b6b81d06de20cd025d6b4b90ec0' 
  AND token = 'UQkRlyTe0WNKSOCdeMiGI6DrZGYRNSv3XhKIuWq3NzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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