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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7391c6d767cb8e8636abdf29ebdaf3f057c2fdd18bc430f437ff5cf46ccc057' 
  AND token = 'fTFz6mFHL1wRCH5e4BQTx6ZdbsBC6ZTqIiEFSq3y7sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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