Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea51428d4915148120ed334c4ce3ea29488ecd3f27d6abb99cfa40c793a8f3d6' 
  AND token = 'MmGelFfMQsc241ZQ6++KlKfc9/ExisCe/Ta0nyOie5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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