Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b305bf3ef350621e1fe3c54c8b2c6d5f2472ee2c378dd5108baadb9f67a22fe' 
  AND token = 'AL5f9xLs0c/8ktb8vkqBx+jr0+Y0BbvJDBv4rYPHLXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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