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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a355b6f1c905450bad7ea8d1d2eea89765d5581bbf935761d483237e3ed46cda' 
  AND token = 'aEMJxyJezST5GbElE7DNSR5XoMskv4QtlJBCDxi6jsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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