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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3d5adede2d9b97550b4f18bfbf6dd75bd892b7634af7611bef92e717aa1917c0' 
  AND token = 'sDeFlGiKAOO4OvOogXUTkSH+6QvFgXkmwtSuGJDtdG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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