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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '826a50bd6448af7591a388c7dc286c1ca21494c09a96cf24f2a4fe15ce092e8d' 
  AND token = 'v1Kw0zH9GuOsomrgxEchpMy/4BJlT9cn4EYg1rE5p2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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