Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0ecc2af2ab471385a025e953fd04fa2c3b09cd0432b21c627e968a5c8f676d' 
  AND token = 'T9jB6PQE2BTGzUFagPiHiji4vs+G2fixeg7FR1QVxGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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