Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c362000f83a273cb1eb7fc3c4a9278594b2cbc0e1241b02964833d0dc18b34' 
  AND token = 'PQzFjHR24HBnKnqZ4KZlEf5bb2fPHy+bAVPSgyxV4qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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