Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa8024a1ec51da6dfce4cc651c3a943b978a7dc9efaaa21e3b42a419b9012d9' 
  AND token = 'KwMwjK65btKg97Q76mi8+Diz/6qWZHgAZj9wcJE+CNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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