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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a2b1db38cedbd3e3270c65244561c5692b0613245f62924ccf426c27ed97ad2' 
  AND token = '4B8CrB1EQ10vpqKTKkl6IiXilWPFR6PsmTKFL9qfJ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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