Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce01f82102508e105deea12994443b228ee0e2154f35154d63949c92bceac66' 
  AND token = '83mtOufTZVPmts24NYtn6i3VZ6y7XR3+RCxzJ9HfCcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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