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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b40c5d8a1a0e97c482a9a9b9a069e13761ed11eb933274e9999cc2bfb31dadb' 
  AND token = 'A0B/4H10JPanF5JsHxZJEgBgKPE1rlsbYlc7NPEOV4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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