Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f637260683809c0b426d342315bb1e44019c7e3b88de7295a2a5d5cbac9e986' 
  AND token = '3waNCtEarLjE5Y3bB6C44xeb9lPH2jsdy5bVN6vs0ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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