Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abb7d1f07e1fb44b916d597d07030fc7d8c0ccb6491b8299a95f41cb10a5c78' 
  AND token = '4fi9Zvz+28Z2uOhlDFWoaK+rlAPCDX4D6Fnt7mCDdno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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