Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45323a594ec47e8c8160d7963d234535e6d53d85010e5913ed865f121f8385ac' 
  AND token = 'Bt1cFt2BK2Fja7JdyJCg0ofhJS3OFqFbTP3UYsp2et0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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