Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6ddf868445aaf6b746e930a0cb3ffe34a1dd54322ac03073dcd2542ce352f2' 
  AND token = 'MsivRR+tzyc5iTSa8ArUHEH8cedhaxCXWnsaHb7KTH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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