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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cccf255221e4646b6c3a8767e8247e234bbd6309abfc58dbbf5be2b90dbf8b21' 
  AND token = 'AncriFm31Q3YrG2Jypb9XucdRkNdwTLyl1cWdvI1xhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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