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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1312d278596b18da1829848e94594de72504552db96af6c4cd8bc24a60819866' 
  AND token = 'duYnhukUdr050CFbwn/zTq/VphaDbgmcpEtwJd2lM2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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