Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d5cf9af03a7b1f0bf3a7b63411a8754c5dce7b5a4ed19e1ef7be1ca1f18756' 
  AND token = 'MYzLcsYnjslyF3n3nrWRs4g7NxFfHkoZcod8AgrEyIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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