Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a4927e792e0b766c24fe9df744ee461c6373299e2fe53bec2622f657adfe8a' 
  AND token = 'gFhDZ/Xz9xLAy4J2rj77yAy9y8Jg0YE9tyND5c2XyYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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