Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18515d7b9220bc357de4e407b283fd569278824a903fd21b5de2bae0406f965a' 
  AND token = 'F2oHVehBARePN/GuqMqtAE4lUA8CTlXSfYwDPHSZMDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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