Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8640360e16d39b64273f47beec82e1d0f89b33493198ce3529fc58f89cf51d' 
  AND token = 'igO0vMw8O55TyUy8ni5+323ODEzy2wUPCtbeAmo9HpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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