Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5ed9585ee225c8a8d4c0d2c6cec3bda223d954dc05ed38f34e655f9a4bb5d5' 
  AND token = 'bZaPNdMdBw3HBU3m6DtxbxW3NKPsPWCOx36gBGEIv04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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