Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d67790aa2882ca98c86b139575ada9cb7376c0915a5b80dedb9a41ff9c677a2' 
  AND token = '1uBjXSeVR7Dlo1DkHJZFmNWc6k1NGN8LENtuDT2/lKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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