Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a470d9c4c1d24c5eac33fd32c82827781f74a75b9a5c7ac161cb006c5e6d830' 
  AND token = '71+HipLMK6n7KsPymPsy96qz1I817GuofMugl9g7vIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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