Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a6a5c01db651c5774de80f13a02bc352756a94b51aa24fa02e818f4c7e3739' 
  AND token = 'ICaOC0kcN2WbTEMbVe6xVdtf7x8arvS4hC/0O8AEoYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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