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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e420bfbb1ef2e62fe8dd6dd5766c4826e5e17aa1c94768497682d8c5c232b4a' 
  AND token = 'BbRoxjPu/lZbLYtyX9xGJlbCFy6U6ma43Z2Aoq8HKxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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