Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0c9974ec353b74936d263ccdb4929dbcd49f66e6175f7ff0e997488ca16ddb' 
  AND token = '9ClAkdEO4Ug+1RxyFDdW4goFFo0r/zJ/gASSFqOpqHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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