Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d7b8b582e605aad28a50f4048b91e4377826c905cc9abb485cde0ef595dadd' 
  AND token = 'lrQwPCY8i6v4Z88KwYP/Ve4o6lknISROC6MWUTBnflg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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