Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1555662b4049f25d273082431568ab14e53128fdea16b1ed54e72cb0aadd0d9f' 
  AND token = 'iEr07XCjBuCsPpoRSMoZuy+VN3vlc7uVRY7Jz0RoDMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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