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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd51a6e91fb26db597201b40e8c9ab1b8c95973365183b7a525adff5a61002afc' 
  AND token = 'grfddfwD6XaA+VNF0RUx84KLOQpH5c+TiIdGApC0XtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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