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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8bb8feb2827a9ef5bdeaa47cad6a58f2ae2f79c626145e95d0d2220b5239c862' 
  AND token = '6ziyAn9KqvdRW7H5wIxdEG+mDdPyowRpdxcgYbL528I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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