Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd9c491ff222ab2369796e8ee3ee91869e53c999c965bb714021d3f788e7ec6' 
  AND token = '53Mw8hp0z8hLQGkDHfySwbIi32tGczGeE3hXDOuSlDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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