Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6437cb2bc86305e914d82391eb8ff49be0370e4a2b29826e5036996281e36965' 
  AND token = 'bLQiZG7cJsCap0KdTb0ZI+hPWH4EFusoGD0bVJin1AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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