Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734d04f7a4e1613989634d2fabbe003f05fe3f63a1a0feeda41768e945cd2448' 
  AND token = 'DUeEAJcLzjbGhlTKBzDyGTfGEZLe5/8xlQM6SRs4R8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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