Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b10bbb5342913197880665e262032a70e1d9fc0a3238ddecaa2d208d6e96239' 
  AND token = 'q8LMKl+o6UEmhx91noKNC1lSzROTFHxLQuC9fC9WazU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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