Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543abd193e1ff8f718c4570e4c73b8b431d5e4245adf5f3f314655aaf34d2243' 
  AND token = '1/HSJ0hVojn1qcMRMAWhN2fwlJAHsmh2uVCnNt+PgrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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