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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf427e1a5a7b29364e6fed84c9d2320f10cde2e851cd62668db02189fa571865' 
  AND token = 'eh86HTxNQv6xAx6AwkDAoyS1821w7SRNbDy/gcp8/kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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