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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f82900493574665a3f777aeaf565a8ba6ab9ab2bc2da48cf1770c92e1ee21e3b' 
  AND token = 'kHr1+F1edOfQKCu25BvNWNE7RC/INbwXAIEVW3HXNmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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