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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c7fe56cd3a3a5e1893e73d2520f5df8fc15faeac779b3c06b3cafad8f09e92f5' 
  AND token = 'MJG1yTbp/VXQMbxHjhQ3BBB4zmTP8hK0e1eKVGOarrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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