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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4d0c8bfcb7133a24c786efd40bc5d8f1b31ea5e46e091cad2d86a54383f37b4' 
  AND token = '8BEWbqnUhjxhtFsK+lZSLTHbO8rhhZeF4s8QaEW+YUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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