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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1d042dbddc730ca27a1b0fb1fcc2d15c8217a92b5ea880b00ae3f7ea638f413' 
  AND token = '2bDGmmA+29GElmXwK+aWvA0BKuKc+lYWa6wpDGaFoYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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