Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3a8113587aef31571039a8d07236862f56a607aa308c49564bbbf6f280fe04' 
  AND token = '8G9X/uKh1iWglB2w7zlcs98YN0nOgnoCEpFIU3oPKao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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