Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35014173acb8d77f14389fe610d68113beedb859bccb442a42dd17cae2cde0e8' 
  AND token = 'Dx1mINfgooSaAvIzgXTNi44NPODSAkIzvKuntQs7VGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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