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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13ee5e6f78595af1ab194a99e844c3a8895d41f29051667b1aa5fa513deac9c9' 
  AND token = 'ZQAZpxIvLos+Sfmq+tPcw4an/nVcT9LzaTKd5mTfQPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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