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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e72b62e584b23ad1a0c60836974917d6cdb221c20697848d3075316d7fa8dda9' 
  AND token = '1q7m4uEnqKBpwSudDG5741eMcxtQ2LxWaEwW6HZvTz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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