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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d8223905fb50b948567c685c9a15d0c0eaf503d0af908e3ac4d9dfe3a0aa668' 
  AND token = '7VQu3sHnnyQARLwH/wqkmXDuGkMXFSj5Th+8a9dcw7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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