Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ab3376bd9c21fbb2b879535c81bbaac7672ddd2d4e0e56a718ad6544998714' 
  AND token = '1obxr27SI4ldIqFbUofjL2rlJgiuC9gwQxtt079az+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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