Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b642d6b2ae61eb635a7326a7524446c36a9a9e2e352bce7348f6c0095d5f2dc' 
  AND token = '8nR3Pd3/ukbwL5Vf1+BZPm1t5Z0piGe2dGMPcDWsNY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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