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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e291cde5fcdc7964a0961c27fa74df58dde49d032d94fdcd8a4f845cba07316' 
  AND token = 'c6h7pbdl8d7h6bMsp7N1g+L/TUBDEw5CCVMQapQK4ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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