Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11610a4a24b30989856518797200f823c2cb9a0cc2f709ee69efcb74a141f29' 
  AND token = 'f4cburjwwd98AamBBd6m2rTohfM4rgMA9I8bXdqNuNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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