Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762c1f0f22a1f49cd0cb40a38d92dd24bd81e5d19b7d91e208fdd97ff7152c58' 
  AND token = 'iPXuLWYErc4Gsj0u+OikaNl/AbgSnSjpj+Twzm3io0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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