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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6e5d24f7036c763dfc1c8ff6bd43c0b49dc988ae254dd270b4f30cbeb4909a09' 
  AND token = 'Pdv7D1OLk1q+lJqK2b4MAHmLQM1lW0FicsE13nq1yXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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