Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9864eb9c0bf2e85c8016221bc3628d5d4113b4eacd1a4beaffe45b015b3a94' 
  AND token = 'SUtd2V+XcL0EgLkawqPHi0UUyqGHCvv/5A/slodCuhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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