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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fff0b78ea34c89d0d892b9b11cfebd948e1812c4476838b024ee9f781fdb3b30' 
  AND token = 'DIlj7fqlt/jDQ8wRJsxn4vFnewTf5ECTTfVe8HhKa78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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