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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a99b8cba4898a33a8ea905ce1d211eaa8344b4f6a917a5d57e566122ab5d2a70' 
  AND token = 'biy1ZC5Jd4GILcndppaV6dYH0J23H9XK801pPWRd8JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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