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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '69fccbd61d1b59f1660c0ae00605bfc47974b1b89f21800fddf7a0fc6d19b3bc' 
  AND token = 'NCzm6oJ7QClazOG/0iD40i7jzIIoB+QnuboI82M98iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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