Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df6fd69f4195e75664104b0a53ec51836f490b2b9a813d3495d35d6c6a91bc1' 
  AND token = 'jnbnvL33fmZdaeyhn0SxHSeu5SQNysSsLR/UT8lw0fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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