Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68b4bffce9c8fed7cc9bc8e6a398dada8c4bc68c38b1b8357e53d45cb58302e' 
  AND token = 'fLCt7ulb/KjrWElQsWeeGw61467G2Y5NI/nmJY14034=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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