Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f715b7d54e3702cca6b65a27aa63b240ed022fe9fa7eee107c3b84a695796f4b' 
  AND token = 'HLEvgi/7yYrwFl2FIryvUlJRGijxfp+2p36hq+iDE78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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