Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba828f07aac34442bca52a5c1ad9522a22b71beb1fce11b1113897b9b3c3bbf' 
  AND token = 'EwdMpeKmUd/A2Nq6rCcYPBWKaqORiEgJ8rqhmN9YWYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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