Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a44386836a34547067bf7ac5235d08ee578c8325b186c8fee401bd61018fa1e' 
  AND token = 'NCBEg7XaCQ3vNTwQLv4m5Eo21r+HhRva5aSQf9Qo/Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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