Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efda8d5e080b507fbdcf99ce50a06df78ead3e5201142d3252e50f950a90253d' 
  AND token = 'ffPUnivNeFkkQoA1+fklYScOVio1VNX9wIikQPUnpV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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