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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '360185418ce5c3c3920b28e4842f7ea0818bd4bc42a11e1886e5b010714120ca' 
  AND token = '0f0ctOUXkObATdwMXCe4MR/qtBVuoAAV59T9Ywgqx0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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