Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd636cd146745690754f5835974e05a30a443ed80242226e829420570227965fc' 
  AND token = 'DmBUGXMjppXFNgXUXTzg5bHsXNsQFoAAkV4Obe+xnzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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