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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b8171eb33e97b121b8abc9a80a0531169fe47d8fba9a11e63b8312a921fe56ec' 
  AND token = 'U1Pb99NXG7RxOxGsPqt3sIbZmy3wJ71oCEiqTK75l4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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