Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd898fe20a4d2f64807b108a40085b03056319b491cd7f6790958870aac06efe1' 
  AND token = 'LxPricmUU7MCfVMlynA+Qp9mBlSww47dyQs0hwV54yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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