Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a764eb9f7e08eeac5cf0c3368189e7f636c80cc037ade9b453e618c8efd9fa1' 
  AND token = 'bX7x/NoRE9COZ2JIC8xwPWoEQHuEcyF+IcIEAga10Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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