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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff6e7967105f319b6c7a8afd95ba00a3d0bc21e0e3f670a3ae0c3a839f6b5e28' 
  AND token = 'yJmsXXE/F7xqfrQfwwPU8h/xrKhibLKybtR+Nx+Jtmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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