Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f1af46dee3a78f6d762858d9e86e8aad99d3a62449582a97092a6405139fd6' 
  AND token = 'kNdVnlfyFIIZdAF0VOseWpPEYO/mPaePqyLz34ExLrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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