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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfbddb5df9339c49c78f70c7c795473d5f7c9fed272e725b9edcb2ef93d35341' 
  AND token = '4lkR6cSr85Aa6aDLMGqOLff2RMNF4Lf88TapG+A1nw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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