Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b164e213790327097e1ceb2287ef342f69f2d3567c6d6930419170abb71c0759' 
  AND token = 'r7STiA2sURi7TCrXDLUOVw49jyT0IQUbTUmRI9puAZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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