Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4c9a1a49e2fbe6bd7a67135c8b911d93f8d9fbc4ca6a1726e931a7e854b36e' 
  AND token = 'uhjeUuOBK6W6cNZWrU+2R+omM6K54ThsnYnu53r55r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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