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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a07877aca7798efe99c8c0df7eafa47777550714ecae71a886692c465d8d34e3' 
  AND token = 'pmAfdcLJPnDptAtJgQcaySO+oe3huRh0ZGoDVnvIsDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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